The three types of criss-cross heart: a simple rotational anomaly.

Criss-cross heart is an angiographically confusing malformation where apparent crossing but not mixing of contrast medium is seen at atrioventricular level. The malformation can be understood by a clockwise or counter-clockwise ventricular rotation. In the normal heart or one with complete transposition ventricular rotation is clockwise. With corrected transposition rotation occurs in a counter-clockwise fashion. One case of criss-cross heart with associated corrected transposition and two criss-cross hearts occurring with complete transposition are reported.